Table 4.

Substance use outcomes by presence of withdrawal over 12-months

Independent Variable	Percent Days Abstinent
	Main Effects Only				Interaction
	β	SE	F	p	β	SE	F	p
Age	−4.168	2.400	3.02	0.086	−4.145	2.400	2.98	0.088
Employment	5.884	5.773	1.04	0.311	6.019	5.776	1.09	0.301
Baseline PDA	0.326	0.085	14.82	0.000	0.324	0.085	14.66	0.000
Time	−0.328	0.472	0.48	0.488	0.240	0.712	0.31	0.577
Withdrawal Group	−0.032	5.723	0.00	0.996	−7.142	8.798	0.66	0.419
Withdrawal Group x Time					1.012	0.951	1.13	0.289

Independent Variable	Psychiatric Symptoms
	Main Effects Only				Interaction
	B	SE	F	p	β	SE	F	p
Age	0.031	0.034	0.82	0.368	0.031	0.034	0.81	0.371
Employment	−0.020	0.079	0.06	0.805	−0.022	0.079	0.08	0.781
Baseline Psychiatric Symptoms	0.345	0.059	33.87	0.000	0.345	0.059	33.88	0.000
Time	0.004	0.007	0.31	0.579	−0.005	0.011	0.20	0.657
Withdrawal Group	0.136	0.080	2.93	0.091	0.251	0.133	3.58	0.062
Withdrawal Group x Time					−0.016	0.015	1.17	0.281

Independent Variable	Substance Use Consequences
	Main Effects Only				Interaction
	B	SE	F	p	β	SE	F	p
Age	0.440	1.150	0.15	0.703	0.419	1.149	0.13	0.716
Employment	0.677	2.780	0.06	0.808	0.520	2.780	0.03	0.852
Baseline Consequences	0.369	0.066	31.76	0.000	0.372	0.066	32.17	0.000
Time	−0.131	0.214	0.37	0.543	−0.661	0.318	0.77	0.382
Withdrawal Group	0.272	2.853	0.01	0.924	6.815	4.094	2.77	0.100
Withdrawal Group x Time					−0.949	0.426	4.97	0.027

Independent Variable	Substance Use Severity
	Main Effects Only				Interaction
	B	SE	F	p	β	SE	F	p
Age	0.053	0.054	0.99	0.324	0.057	0.054	1.11	0.296
Employment	0.022	0.128	0.03	0.862	0.015	0.128	0.01	0.907
Baseline Severity	0.204	0.116	3.07	0.084	0.202	0.116	3.00	0.088
Time	−0.035	0.030	1.36	0.247	−0.120	0.042	2.14	0.149
Withdrawal Group	0.112	0.139	0.65	0.422	0.826	0.295	7.86	0.006
Withdrawal Group x Time					−0.157	0.057	7.56	0.008